由于没有什么时间编写解释部分,详细查看源代码:
function [Out] = SampChang(In,OldSamp,NewSamp) len = length(In); oldInterval = 1/OldSamp; newInterval = 1/NewSamp; data = zeros(1,len*NewSamp/OldSamp); if(OldSamp > NewSamp) Fp=NewSamp/2; % 通带 Fs=OldSamp; % 采样频率 Rs=60; % 阻带衰减为60dB Wn=Fp*2/Fs; % 切比雪夫II型滤波器 [C2b C2a]=cheby2(10,Rs,Wn,'low'); % 调用MATLAB cheby2函数快速设计低通滤波器 tmp=filter(C2b,C2a,In); % 进行低通滤波 temp = 0; for(i=0:1:length(data)-1) for(k=temp:1:len-2) if(k*oldInterval <= i*newInterval && (k+1)*oldInterval >= i*newInterval) k2 = (tmp(k+2) - tmp(k+1))/oldInterval; d2 = tmp(k+2) - k2*(k+1)*oldInterval; data(i+1) = k2*i*newInterval + d2; temp = k; end end end elseif(OldSamp < NewSamp) temp = 0; for(i=0:1:length(data)-1) for(k=temp:1:len-2) if(k*oldInterval <= i*newInterval && (k+1)*oldInterval >= i*newInterval) k2 = (In(k+2) - In(k+1))/oldInterval; d2 = In(k+2) - k2*(k+1)*oldInterval; data(i+1) = k2*i*newInterval + d2; temp = k; end end end Fp=OldSamp/2; % 通带 Fs=NewSamp; % 采样频率 Rs=60; % 阻带衰减为60dB Wn=Fp*2/Fs; % 切比雪夫II型滤波器 [C2b C2a]=cheby2(10,Rs,Wn,'low'); % 调用MATLAB cheby2函数快速设计低通滤波器 data=filter(C2b,C2a,data); % 进行低通滤波 end Out = data; end